diff --git a/Deartoday/Deartoday/Screen/CheckMessage/Controller/CheckMessageViewController.swift b/Deartoday/Deartoday/Screen/CheckMessage/Controller/CheckMessageViewController.swift
index f022c45..c64bb33 100644
--- a/Deartoday/Deartoday/Screen/CheckMessage/Controller/CheckMessageViewController.swift
+++ b/Deartoday/Deartoday/Screen/CheckMessage/Controller/CheckMessageViewController.swift
@@ -151,9 +151,9 @@ extension CheckMessageViewController: UICollectionViewDelegate {
 
 extension CheckMessageViewController {
     private func getMessageInfo() {
-        CheckMessageAPI.shared.getCheckMessage { response in
-            guard let responseData = response else { return }
-            self.setMessageInfo(response: responseData.data?.lastAnswer ?? [])
+        CheckMessageAPI.shared.getCheckMessage { [weak self] messageData in
+            guard let messageData = messageData else { return }
+            self?.setMessageInfo(response: messageData.data?.lastAnswer ?? [])
         }
     }
 }
diff --git a/Deartoday/Deartoday/Screen/CheckTimeTravel/Controller/CheckTimeTravelViewController.swift b/Deartoday/Deartoday/Screen/CheckTimeTravel/Controller/CheckTimeTravelViewController.swift
index e190e11..7c5cb3c 100644
--- a/Deartoday/Deartoday/Screen/CheckTimeTravel/Controller/CheckTimeTravelViewController.swift
+++ b/Deartoday/Deartoday/Screen/CheckTimeTravel/Controller/CheckTimeTravelViewController.swift
@@ -133,10 +133,10 @@ extension CheckTimeTravelViewController: UITableViewDelegate {
 
 extension CheckTimeTravelViewController {
     private func getTimeTravelInfo() {
-        CheckTimeTravelAPI.shared.getCheckTimeTravel { response in
-            guard let responseData = response else { return }
-            self.timeTapes = responseData.data?.timeTravels ?? []
-            self.setTimeTravelTapeInfo()
+        CheckTimeTravelAPI.shared.getCheckTimeTravel { [weak self] tapeData in
+            guard let tapeData = tapeData else { return }
+            self?.timeTapes = tapeData.data?.timeTravels ?? []
+            self?.setTimeTravelTapeInfo()
         }
     }
 }
diff --git a/Deartoday/Deartoday/Screen/CheckTimeTravelDetail/Controller/CheckTimeTravelDetailViewController.swift b/Deartoday/Deartoday/Screen/CheckTimeTravelDetail/Controller/CheckTimeTravelDetailViewController.swift
index 31d847b..f740801 100644
--- a/Deartoday/Deartoday/Screen/CheckTimeTravelDetail/Controller/CheckTimeTravelDetailViewController.swift
+++ b/Deartoday/Deartoday/Screen/CheckTimeTravelDetail/Controller/CheckTimeTravelDetailViewController.swift
@@ -186,12 +186,12 @@ extension CheckTimeTravelDetailViewController: UICollectionViewDelegateFlowLayou
 // MARK: - Network
 
 extension CheckTimeTravelDetailViewController {
-    func getTravelInfo(timeTravelId: String) {
-        CheckTimeTravelAPI.shared.getTimeTravelDetail(timeTravelId: timeTravelId) { response in
-            guard let info = response?.data as? CheckTimeTravelDetailResponse else { return }
-            self.travelInfo = info
-            self.dialogs = info.messages
-            self.collectionView.reloadData()
+    private func getTravelInfo(timeTravelId: String) {
+        CheckTimeTravelAPI.shared.getTimeTravelDetail(timeTravelId: timeTravelId) { [weak self] travelData in
+            guard let travelData = travelData?.data as? CheckTimeTravelDetailResponse else { return }
+            self?.travelInfo = travelData
+            self?.dialogs = travelData.messages
+            self?.collectionView.reloadData()
         }
     }
 }
diff --git a/Deartoday/Deartoday/Screen/Main/Controller/MainViewController.swift b/Deartoday/Deartoday/Screen/Main/Controller/MainViewController.swift
index 16a79c8..fc88d53 100644
--- a/Deartoday/Deartoday/Screen/Main/Controller/MainViewController.swift
+++ b/Deartoday/Deartoday/Screen/Main/Controller/MainViewController.swift
@@ -33,7 +33,7 @@ final class MainViewController: UIViewController {
     override func viewDidLoad() {
         super.viewDidLoad()
         setUI()
-        setData()
+        setDate()
         setDelegate()
         setGesture()
         setBackSwipeGesture()
@@ -54,10 +54,6 @@ final class MainViewController: UIViewController {
         setLayout()
     }
     
-    private func setData() {
-        setDate()
-    }
-    
     private func setDelegate() {
         backgroundScrollView.delegate = self
     }
@@ -144,9 +140,9 @@ extension MainViewController: UIScrollViewDelegate {
 
 extension MainViewController {
     private func getMainData() {
-        MainAPI.shared.getMain { mainData in
+        MainAPI.shared.getMain { [weak self] mainData in
             guard let mainData = mainData else { return }
-            self.setCountLabel(count: mainData.data?.timeTravelCount ?? 0)
+            self?.setCountLabel(count: mainData.data?.timeTravelCount ?? 0)
         }
     }
 }